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IBM WebSphere Application Server Liberty Multiple Vulnerabilities

A remote, authenticated attacker can exploit multiple vulnerabilities in IBM WebSphere Application Server Liberty to escalate privileges, bypass security measures, and disclose information.

IBM WebSphere Application Server Liberty is affected by multiple vulnerabilities that could be exploited by a remote, authenticated attacker. According to the BSI advisory published on March 25, 2026, successful exploitation can lead to privilege escalation, circumvention of security measures, and sensitive information disclosure. While the specific CVEs and techniques are not detailed in the source material, the broad impact across multiple security domains makes this a significant risk for organizations using the affected software. Defenders should prioritize identifying WebSphere Liberty instances and implementing mitigations as they become available.

Attack Chain

  1. The attacker authenticates to the IBM WebSphere Application Server Liberty instance using existing credentials or compromised credentials.
  2. The attacker leverages a vulnerability in the application server to bypass access controls.
  3. Using the bypassed access, the attacker gains access to administrative functions or APIs.
  4. The attacker exploits a privilege escalation vulnerability to gain higher-level privileges within the application server.
  5. With elevated privileges, the attacker accesses sensitive configuration files and data stored within the application server.
  6. The attacker exploits a vulnerability that allows the reading of arbitrary files on the system.
  7. The attacker exfiltrates sensitive information such as user credentials, API keys, or proprietary data.

Impact

Successful exploitation of these vulnerabilities can have severe consequences. An attacker could gain complete control over the WebSphere Application Server Liberty instance, leading to data breaches, service disruption, and potential lateral movement within the network. The number of victims and sectors targeted are currently unknown, but any organization using IBM WebSphere Application Server Liberty is potentially at risk.

Recommendation

  • Monitor WebSphere Liberty server logs for suspicious activity following authentication to detect potential privilege escalation attempts (reference: Attack Chain step 4).
  • Implement the generic privilege escalation detection rule to identify unauthorized attempts to elevate privileges (reference: rules).
  • Implement the security measure bypass detection rule to identify possible vulnerability abuse (reference: rules).

Detection coverage 2

Generic Privilege Escalation Detection

high

Detects potential privilege escalation attempts based on process execution

sigma tactics: privilege_escalation techniques: T1068 sources: process_creation, windows

Security Measure Bypass via Web Server Logs

medium

Detects potential security measure bypass attempts by analyzing web server logs for unusual HTTP status codes or URI requests.

sigma tactics: defense_evasion techniques: T1068 sources: webserver, linux

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